Reid says that the only reason the unsub would be interested in vampire culture was because of the vampire worship. However the main reason a "vampire" would be interested is the free buffet. There is no better place for a "vampire" to find willing donors.
When discussing Renfield Syndrome the team mention that it is named after the character in Dracula, but completely miss the reason for the name.
After drinking their own blood, suffers move on to small creatures like rats, spiders and insects, as Renfield did in the novel.
When delivering the profile, Reid mispronounces 'triad' as 'tree-ad'.
Around the 25:30 mark, a reporter is banging on the SUV's passenger window. There are banging sound effects, which don't match up with the visual, but the open door doesn't move.
The camera and crew are reflected in the glass wall of the meeting room as they move to the left.
Prentiss casually mentions that she attended Georgetown University. But in her first appearance in The Last Word (2006), she specifically tells Hotch that she attended Yale. No mention is made of ever having transferred colleges.